Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc16e8e28c2ea43c…

MALICIOUS

PDF

84.5 KB Created: 2021-02-26 00:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 504b441e6f5609546de8293216ea9d7a SHA-1: b4ea64acfe69f02ad1cb11a4eb0ebcfb71fbc9f2 SHA-256: bc16e8e28c2ea43cd82ec860739f15c81bc117ba4f1e942a74355cc0fd08d051
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/strik?utm_term=export+marketing+plan+sample+pdf PDF link annotation
    • https://biweworu.weebly.com/uploads/1/3/4/5/134525234/cb3a536af.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/paxupozojapikew.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/taoygja/rawazawos.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/47788840583.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/129d057c08a72e.pdfIn PDF document text
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/4283592.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/gjKEhcs/gagularesagakezexexizuk.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/agudas_graves_o_llanas_esdrjulas_y_sobreesdrjulas.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/82404772032.pdfIn PDF document text
    • https://rugexosijebup.weebly.com/uploads/1/3/4/0/134017508/wubukikakix.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/how_much_does_a_swat_officer_make_in_texas.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/what_is_the_darkest_minds_available_on.pdfIn PDF document text
    • https://putajomarope.weebly.com/uploads/1/3/1/4/131437676/f0c415.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/when_worlds_collide_movie_cast.pdfIn PDF document text
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/6777373.pdfIn PDF document text
    • https://kujadivenudeku.weebly.com/uploads/1/3/5/3/135324903/1934961.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juzinaramip/formule_centre_de_gravit_d_un_triangle.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/liger_or_tigon_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/gamawojevigafiloreserali.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/how_far_away_is_voyager_1_and_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/open_office_spreadsheet_compare_columns.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 5236 bytes
SHA-256: 79497e0f7fcc00649ebbcc202b9f69cc328a7b04c24e3909fd42ea3f916236e9
font_01_sfnt_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 10240 bytes
SHA-256: 3a29d4e957b98b46e561e29a429cb69b5e4e67c90016e008e7e07619aee40d77
font_02_sfnt_off0001363b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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